Saw-mill set-works



(No Model.)

4 Sheets--Sheet 1. DE WITT 0. PRESOOTT' SAW MILL SET WORKS.

' No. 368,730. Patented Aug. 23, 1887.

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(No Model.)

' 4 Sheets-Sheet 2 DE WITTG; PRESCOTT.

SAW MILL SET WORKS.

Patented Aug. 23, 1887.

.(No Model.) 7 4 Sheets-Sheet 3.

DE WITT G. PRESCOTT.

SAW MILL SET WORKS. No. 368,730. Paten ted A11g Z3. 1887. i Y 9 N.FKTERS, Pholo-Liihngnipher. \mmn mmmmm c (No Model.) 4 Sheets-Sheet 4.

DE WITT G. PRESCOTT.

SAW MILL SET WORKS.

No. 868,730. Patented Aug. 23, 1887.-

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SAW-MILL SET-WORKS.

SPECIFICATION forming part of Letters Patent No. 368,730, dated August23,1887.

Application filed August 2, 1886. Serial No. 209,797. (No model.)

To allwhom may concern:

Be it known that 1, DE Wrrr CLINTON Pans oo'r'l,a citizen of the UnitedStates, residing at Marinette, in the county of Marinette and State of\Visconsin, have invented certain new and useful Improvements inSaw-Mill Set-WVorks, which are fully set forth in the followingspecification, reference being had to the accompanying drawings, inwhich- Figure 1 represents a plan view of a portion of a log-carriageprovided with set-Works embodying my improvements; Fig. 2, an elevationof the same; Fig. 8, a section of the same, taken on theline x 00, Fig.1; Fig. 4, a similar section of the same, taken on the line y 3 Fig.

1; Fig. 5, a section taken on the line 2 .2, Fig. 3; Fig. 6, a sectiontaken on the line 0 c, Fig. 3; Fig. 7, a plan section taken on the linew w, Fig. 3; and Fig. 8, a plan view of one of the pawls detached.

My invention relates to setting mechanism for sawmills, by which theknees or standards which hold the log in line with the saw are adjustedlaterally after each cut for the purpose of moving the log into properposition for the new out. In a general way the mechanism is the same asshown in Letters Patent heretofore granted to me, No. 310,848, January13, 1885, and No. 257,757, May 9, 1882, and the present invention may beregarded as an improvement upon the set-works shown in the said patents.

The object of the present invention is to simplify the construction byusing only one ratchet-wheel, and the improvements relate to devices bymeans of which this plan of mechanism is made available and practical.

I will proceed to describe in detail a setting mechanism in which I havepractically embodied my invention in one way, and will then point outdefinitely in the claims the particular improvements which I believe tobe new and wish to protect by Letters Patent.

In the drawings, A represents a portion of the carriage, which is ofordinary construction, and is provided with headblocks and knees,substantially as shown and described in my prior patent, No. 310,848.The setshaft B is also arranged substantially as in said patent, and isconstructed to'operate substantially as therein described. A singleratchetwheel, 0, is fastened to this shaft, being provided with teeth 0upon its periphery, whereby it is turned by pawls to rotate the shaftfor the purpose of setting up the carriage. On each side of this wheelis a bracket or shell, D, which is of circular form, and extendingnearly halfway around the wheel, commencing at a point above the latterand extending down between it and the adjacent side sill of thecarriage, as shown in Figs. 2 and 3 of the drawings. These shells are ofsomewhat greater diameter than the wheels, and are provided at theperiphery with a lip or flange, d, projecting inward at right anglestoward the wheel, as shown in Fig. 6 of the drawings. The shells areattached to or cast in one piece with bracket supports d, which arefastened at their outer ends to the carriage-sill, and at their innerends are supported by the setshaft, which passes loosely through them,they being provided at this point with hubs or bosses, through which thesaid shaft passes and from which spring the shells above men tioned.

The pawl-carriers Eare wide pieces of metal and of curved form, adaptedto fit between the shells just within the flanges of the latter. Theseflanges on the two shells are embraced by suitable right-angled lips orflanges, e, rising from the surface of the pawl-carriers, so that thelatter will be held upon and guided by the flanges of the shells, onwhich they are free to be moved back and forth. The pawls F are ofsuitable form to engage with the teeth of the ratchet-wheel, and arenearly or quite as wide as the ratchet-wheel. The back of each pawl isforked or cut out centrally, so as to present lugs or projections f oneach side, as showuin Fig. 80f the drawings. The pawls are pivoted tothe carriers by means of these lugs, through which a pivot-pin, 0,passes, which is inserted through cars 6 at the under side of thepawl-carriers, aboutmidway of the latter, and the carriers are cut awaycentrally to accommodate the attachment of the pawls and other parts, asshown in Fig. 1 of the drawings. The pawls are also provided with aprojection, f, extending out laterally from one side thereof, as shownin Fig. 8 of the drawings. There are two pawl-carriers-one at the upperand the other at the lower end of the shells, as shown in Figs. 3 and ofthe drawingsand each has a single pawl hinged thereto, which is arrangedto extend forward from its respective carrier, as seen in the samefigures, so as to be operative in the same direction. end to the rearcross-beam of each pawl-carrier' and its other end is depressed, so asto rest upon the pawl, thereby holding it in engagement with theratchet-wheel.

Pitmen G and G are pivoted, respectively, to the pawl-carriers, beingarranged on the pivot-pins 6 between the forks of the pawls. The otherends of these pitmen are pivoted to a vibrating plate, H. This plate isof triangular shape, and is arranged in a vertical plane,being fastenedto a rook-shaft, 71, mounted in hearings on the sill of the carriage infront of the ratchet-wheel. The plate is arranged with one of itsnearly-straight edges toward the wheel, and the pitmen are pivoted tothe respective corners, the upper one, G, being connected to the uppercorner, and the lower one, G, to the lower corner, as seen in Figs. 3and 4 of. the drawings.

A hand-lever, h, is also fastened to the rockshaft h, by means of whichthe latter is oscillated to vibrate the plate. The arrangement of thepitman-plate with reference to the ratchet-Wheel is such that the upperpitman extends out in a nearly horizontal direction therefrom, workingover the top of the wheel, while the lower pitman depends from the platein a direction nearly at right angles to the upper one, and works up anddown in front of the wheel.

Now, it is evident from the construction and arrangement of thesedevices, just described above and shown in Figs. 3 andd of the drawings,that when the rock -shaft is oscillated forward it will throw the upperpitman forward, thereby turning the wheel by the action of the upperpawl; but this movement of the plate will thrust the lower pitmandownward, thereby moving the lower pawl back over the ratchet-wheel. Thebackward or reverse vibration of the plate will of course reverse themovement of the respective pitmen, the lower pawl now becoming operativeto turn the ratchet-wheel, while the upper one is pulled backward overthe teeth. It will be seen, then, that the oscillation of the rock shaftby the hand-lever will always turn the ratchet-wheel forward, first onepawl,,then' the other, acting upon this single wheel.

The device by means of which the pitmen are connected to the rock-shaftneed not be a plate necessarily. Arms arranged at the proper angle toeach other, or any other suitable device whereby the pitmen may beconnected to the rock-shaft in proper relation to produce the movementsrequired and described above, will serve the purpose equally as well.One of the shells D is also provided with aboss, d projecting out at oneside, substantially rectangular in shape and arranged radially to theset-shaft. On the inside of this boss are dove tailed ways d withinwhich is seated a plate, I,

A bent spring, f, is fastened at one these ways. This plate I is thickenough to extend inward to the face of the ratchet-wheel, alongside ofwhich it is carried out nearly to the periphery. It is provided withwings a, extending from each side edge thereof, and of circular form ontheir outercontour, to correspond with the wheel. Thesewings extendbeyond the respective pawls and are arranged at the side of the wheel onwhich the lips or projections f of the pawls are found. These lipsproject beyond the periphery of the wheel, and obviously the wings ofthe plate I will come underneath or just within them. Now, as the plateI is reciprocated upon its ways, it is evident that the outward movementwill bring the wings into contact with the pawls, and so lift them fromengagement with the wheel, while the inward movement will permit them toengage again with the wheel under the influence of their springs. Theplate I therefore becomes a pawl-lifter for disengaging the pawls fromthe ratchet wheel whenever desired. A circular opening, 13, is

made through the body of the plate I, and is elongated somewhatlaterally, as shown in Fig. 30f the drawings. Within this opening isarranged a cam or eccentric, J, the stem j of which extends outwardthrough the shell, which is constructed with a hub-bearing for thelatter, as shown in Fig. 7 of the drawings. On the outer end of the stemis a lever, K, by means of which the eccentric may be oscillated,thereby reciprocating the pawl-lifter I to lift the pawls from the wheelor permit them to engage therewith, as may be desired. A graduatedquadrant, L, is mounted on the carriage at one side of the wheel, and sothat the actuating-lever of the pawls will move along by it in the usualway and for the usual purpose.

It is obvious that the ratchet-wheel may be set forward with eachvibration of the lever, thereby turning the set-shaft .so as to set upthe carriage in the usual manner, and this movement may be graduated toany required degree of fineness by the scale on the quadrant. Thismechanism is much simpler than that described and shown in either of myprior patents mentioned above. There is only one ratchet-wheel and oneset of pawls and pawlcarriers, which are connected to a single lever;but at the same time I am enabled, with this simple device, to effectthe proper setting of the carriage and with such precision and finenessas are necessary for practical purposes.

I do not wish to be understood as limiting myself in all particulars tothe precise details of construction as herein described and shown, formechanical changes may be made without departing from the main ideas ofmy invention, and different devices may be substituted for some of thosehere described. Ihave shown and described a very satisfactory workingderzc which may be made in the mechanism without departing from the mainfeatures of my improvement.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The set shaft, in combination with a ratchet-wheel secured thereon,the fixed shells arranged on each side of the wheel and forming fixedways to receive the pawl-carriers, and the reciprocating pawl-carriersmounted on said shells or ways, substantially as and for the purposesspecified.

2. The setshaft and a single ratehetwheel secured thereon, incombination with the fixed shells arranged on each side of the wheel andforming ways to receive'the pawl-carriers, the reciprocatingpawl-carriers mounted on said shells or ways, pawls attached to thecarriers and arranged to engage with the ratchet-wheel in the samedirection, and mechanism for reciprocating the pawl-carrierssimultaneously in opposite directions, substantially as and for thepurposes specified.

3. The ratchet-wheel G, in combination with th'efixed shells D, arrangedon each side thereof and provided with inwardly extending flanges d, andthe reciprocating pawl-carriers E, arranged within the shells D andprovided with flanges 6, extending outward over the flanges d of theshells, substantially as and for the purposes specified.

4. The ratchet-wheel, in combination with the separate fixed shells toreceive the pawlcarriers, the pawl-carriers E, cutaway centrally, asdescribed, to receive the pawls, and the pawls F, pivoted to thecarriers and arranged within the cutaway portion, substantially as andfor the purposes specified.

5. The set-shaft B, in combination with the single ratchet-wheel Cthereon, the fixed shells D, to guide the pawlcarriers, thepawl-carriers E, mounted on said shells, the pawls F, the pitmen G andG, and the rock-shaft h, and triangular plate H, substantially as andfor the purposes specified.

6. The ratchet-wheel, in combination with the shell D, provided withways 61" upon its inside, the plate I, seated in said ways and providedwith wings t, the eccentric J, mounted in the shell and'arranged to workin an opening in the plate I, and the pawls F, provided with lateralprojections f, substantially as and for the purposes set forth.

DE WITT CLINTON PRESCOTT. Witnesses:

N. P. Mans,

JOHN J. ANDREW.

